import { NamingStrategy } from './NamingStrategy';

export class UnderscoreNamingStrategy implements NamingStrategy {

  classToTableName(entityName: string): string {
    return this.underscore(entityName);
  }

  joinColumnName(propertyName: string, className?: string): string {
    return this.underscore(propertyName) + '_' + this.referenceColumnName();
  }

  joinKeyColumnName(entityName: string, referencedColumnName?: string): string {
    return this.classToTableName(entityName) + '_' + (referencedColumnName || this.referenceColumnName());
  }

  joinTableName(sourceEntity: string, targetEntity: string, propertyName?: string): string {
    return this.classToTableName(sourceEntity) + '_to_' + this.classToTableName(targetEntity);
  }

  propertyToColumnName(propertyName: string): string {
    return this.underscore(propertyName);
  }

  referenceColumnName(): string {
    return 'id';
  }

  private underscore(name: string): string {
    return name.replace(/([a-z])([A-Z])/g, '$1_$2').toLowerCase();
  }

}